A and B are two cars travelling to a destination which is 360 kilometres away. A takes 4 hours to reach the destination. How much time will it take B to reach the destination if the speeds of A and B are in the ratio 9: 12 ?
A. 2.5 hrs
B. 3.5 hrs
C. 4.5 hrs
D. 3 hrs
Answer : D. 3 hrs
Explanation :
9x/12x = 9/12
Time = Distance / Speed
4 = 360/9x
so x = 10
12x = 120
Time taken by car b = 360/120 =3 hour
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